"The Dark Knight" will rent for $3 or 30 Facebook credits, according to TheHollywood Reporter. Viewers who rent the film will be given 48 hours to watch it and still have full Facebook functionality. The 2008 film starring Christian Bale as Batman is considered a test for the Hollywood studio -- and its first attempt at direct-to-Facebook rentals.

"Facebook has become a daily destination for hundreds of millions of people," Thomas Gewecke, president of Warner Bros. Digital Distribution, told THR. "Making our films available through Facebook is a natural extension of our digital distribution efforts. It gives consumers a simple, convenient way to access and enjoy our films through the world's largest social network."

If the rental is a success, Warner Bros. plans on rolling out other titles along with direct movie sales on Facebook.

It makes sense that the next step for Facebook is actual goods -- it's already done well with virtual ones. While I'm not sure a three-year-old movie is the best choice for a test market on Facebook, at least it signifies a change in how movie studios and social media will do business.